You add another "great" for each generation back in history. So the mother of your great great great grandmother is your great great great great grandmother.
You grandmother's father is your great grandfather and his wife (your grandmother's mother) is your great grandmother.
Your great grandmother's sister is your great-great-aunt.
The English language does not include a relationship called "great mother." It has terms "grandmother" (the mother of your father or of your mother) and great grandmother (the mother of one of your grandparents. The sister of your grandmother is your great aunt. The sister of your great grandmother is your great great aunt.
She could be your grandmother. Or she could be your great aunt.
Your Great Great grandmother's sister is your Great-Great-Great-Aunt
The term that comes after "great grandmother" is "great great grandmother." The "great" prefix is added for each additional generation, so it would be "great grandmother 1x" for one generation back and "great great grandmother 2x" for two generations back. Therefore, the correct term is "great great grandmother."
Your grandmother's grandmother is your great-great-grandmother.
Your great grandmother's mother is your great great grandmother.
Tatarabuela Grandmother: abuela Great grandmother: bisabuela Great great grandmother: tatarabuela
Your father's grandmother is typically referred to as your great-grandmother.
your great great grandmother.
Your great grandmother's brother is your great great uncle.
You grandmother's father is your great grandfather and his wife (your grandmother's mother) is your great grandmother.
Ruth was the great grandmother of King David.
Your great grandmother's sister is your great-great-aunt.
The compound noun great-grandmother is the singular form. The plural form is great-grandmothers.
Your grandmother's sister is your daughter's great great aunt. Your daughter is the great great niece of your grandmother's sister.